Understanding nature does not require maths, but an understanding of physics. Momentum / impulse / impact is immediately understood when it comes to solid bodies such as Newton's pendulum. It's different when it comes to fluids (liquids and gases), which you can't see straight away - but it's the same principle.

Picture: NASA Endeavour landing at KSC

Air has an enormous internal energy potential. This means that if it is possible for local differences in air pressure to be generated which are separated from each other by a barrier (wing), then enormous forces can act on the barrier (wing). If bodies/wings positioned in relation to the direction of movement accelerate air downwards (impulse), then areas of different air pressure are formed. Overpressure at the bottom ("pressure cushion"), underpressure at the top ("pressure deficit"). Air pressure forces are only transmitted from the side of the higher pressure (air cannot "suck" - only push). The higher pressure acting on the underside of the wing is offset by the lower pressure on the upper side of the wing (pressure difference), resulting in an upward force, the lift force.

The "pressure deficit" is not formed by a flow that would be caused by the longer running distance of the airfoil spine. The "pressure deficit" is essentially created by the geometric opening of the wing (angle of attack). In the short time of the passing (airspeed and inertia/viscosity of the air), the space opening cannot fill up completely (deficit). A wing or a wing cross-section ( airfoil) is optimized to create the required pressure ranges most effectively and to achieve controllable flight characteristics.

An aircraft is moving, the air is essentially stationary. When air is accelerated (angle of attack), it is mainly deflected downwards and upwards (vertically) and flows back again immediately after the wing passed. Flow suggests a movement of the air along the surface of the body (horizontal), which does not exist in this form when flying; when looking at streamlines, the inertial system of the body is used, not that of the air.

It is misleading to refer to terms such as Bernoulli, circulation or other phenomena as causes when explaining dynamic lift - they are only effects and not causes in the sense of classical mechanics. It is better not to mention these terms at all when attempting to explain the phenomenon in order to avoid confusion.

Above all, however, it is advisable not to use the general term "flow" or airflow, which originates from fluid dynamics, when talking about dynamic lift. The term "unsteady flow" is applied to the movement of the displaced air particles at the beginning of the movement, but not to the actual state of flight.